body { 
    display: block;
    background-color: #ACA0AF;
    width: 800px;
    margin: 0 auto 0 auto;
}
.superior{
    height: 100px;
    color: #AFA0AC;
    background-color: chocolate;
}
.central{
    min-height: 500px;
}
.menu{
    border-color: antiquewhite;
    border-width: 1px;
    float:left;
    min-width: 100px;
}
.contenido{
    float:left;
}
.pie{
    clear: both;
    background-color: black;
    color: white;
    text-align: center;
}
